I checked walmart, kmart and other stores no one sells calculators anymore. Ebay has a few but not what I want and they seem over priced. Online calculator works but I need a calculator for my shirt pocket. I had 2 nice calculators 1 died the other vanished. I need a solar charge calculator sometime handy easy to use at the desk and work bench.
I saw some cheap battery/solar calculators with the photo of a solar panel on top. It looked real. But the little button battery cell lasts a long time and is cheap.
Office Depot among other places that are brick and mortar office supply businesses. All you need to do is visit an office depot, more or less define what you want as in what functions you want the calculator to do and pick your poison. I have an old TI 31 I got as part of a business course I took about 30 years ago and it still works fine and requires little light to power it. I also have a much more elaborate TI 83 Plus, large, bulky and battery powered. Anyway, I would start with an Office Depot or similar and pick your poison.